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climits: unsafe #defines?

From: Denys Vlasenko <vda dot linux at googlemail dot com>
To: gcc at gcc dot gnu dot org
Date: Sun, 8 Jun 2008 18:33:02 +0200
Subject: climits: unsafe #defines?

Accudentally noticed this in my freshly built 4.3.1 tree
in climits C++ header file:

#ifndef LLONG_MIN
#define LLONG_MIN -__LONG_LONG_MAX__ - 1
#endif

#ifndef LLONG_MAX
#define LLONG_MAX __LONG_LONG_MAX__
#endif

#ifndef ULLONG_MAX
#define ULLONG_MAX __LONG_LONG_MAX__ * 2ULL + 1
#endif


Think what will happen in this code:  if (n < ULLONG_MAX / 20)...
--
vda

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